Frequently asked questions

No – our lenses filter out 20-45% of harmful blue light from the 400–455nm range, which is the optimal balance between an efficient level of protection and an aesthetically pleasing clear lens.

It is physically impossible to filter out 100% of blue-violet light with a clear lens. As a comparison, sunglasses can filter out up to 90% of blue-violet light.

Our blue cut lenses are safe, and they mimic and reinforce your eye's natural protections. They are non-intrusive, they preserve vision – including colour perception – and they allow blue-turquoise light to pass through during the day, helping your circadian rhythm, while filtering out harmful blue-violet light. Generally, glasses that filter blue-violet light have a slightly perceptible residual tint on the lenses, but this is kept to a minimum in our Blue UV™ lenses.

Blue light scatters more easily than other visible light, which may make it difficult for your eye to focus when it's receiving blue light. This reduction in contrast promotes discomfort and may contribute to eye strain symptoms and dry eyes. Still, there isn’t enough research to confirm that blue light directly leads to eye strain and that currently available blue light glasses help. More high-quality studies are needed in this field.

To help reduce digital eye strain symptoms, we recommend wearing lenses that have accommodative support and UV protection, like Essilor® Eyezen®.

Differently to UV rays, blue light is emitted by both natural (sun) and artificial lighting, notably digital devices.

No – the blue light range is wide (380–500nm). We distinguish between blue-violet (400–455nm) and blue-turquoise (460–500nm) light:

  • Blue-violet light, also called 'harmful blue light', has been proven to accelerate retinal ageing. This is the light we target with our blue light glasses to keep your eye health at its best.
  • Blue-turquoise light synchronises bio-rhythms like sleep and wakefulness, so it should be preserved during the day and lowered at night. Our lenses don't target this kind of blue light, so you can keep your body clock ticking happily along.

No – our blue light glasses are designed for use all day long to limit harmful blue light and preserve helpful blue-turquoise light. While they are designed to keep your eyes safe and healthy, they are not designed to help you sleep better. For a better sleep, we recommend avoiding using digital devices for at least 1 hour before bed.

No. In everyday life, the sun remains our main source of blue light exposure and accounts for a much larger amount than that emitted by artificial lighting and digital devices. For instance, during the day, blue light from the sun passing through windows contributes in a more significant way to indoor blue light exposure than artificial lighting does.

We recommend wearing blue light glasses every day, all day long, particularly when you are exposed to sunlight, as a simple, non-invasive way to protect against the cumulative effects of blue light.